midnight on December 31, 2008, many first generation Zune 30 models froze. Microsoft stated that the problem was caused by the internal clock driver written by Freescale and the way the device handles a leap year. It automatically fixed itself 24 hours later, but an intermediate "fix", for those who did not wish to wait, was to drain the device's battery and then recharge after 12 noon GMT on January 1, 2009. The first generation and later Zune devices included a number of social features, including the ability to share songs with other Zune users wirelessly. Songs that had been transferred over wi-fi could then be played three times over three days. Second generation The first wave of the second-generation (Zune 4, 8, and 80, manufactured by Flextronics), introduced the touch-sensitive Zune Pad, which was shaped like a squircle. The 4 and 8 GB Zune devices use flash memory and are smaller in size than the 80 GB version, which uses a hard drive. The 30 GB Zune was not redesigned, although it received a software update that brought its interface in line with the second generation models. At the same time, the Zune 2.0 software was released for Windows PCs. This version of the software was completely re-written and featured a new user interface. Zune devices feature games developed using an early version of XNA Game Studio 3.0, released in May 2008, allowed developers to work on games for Zune devices. The second and last wave of the second-generation (Zune 16 and 120) released in September 2008, coinciding with the release of the Zune Software 3.0 update. Included in this firmware update was the ability to tag and later purchase songs heard on FM radio, channels which can be customized to deliver suggested songs for the user, the games Hexic and Texas Hold' em were added, support for audiobooks from online stores such as Audible.com and others that support OverDrive media files, a clock, and changed quicklist functionality. The ability to purchase songs from Zune Marketplace on the device while connected to the Internet via Wi-Fi was also introduced. To help push this feature, Microsoft partnered with Wayport to allow Zune devices to access its network of over 10,000 wireless hotspots, including those at McDonald's restaurants. Zune Pass customers in the United States could also now download 10 tracks to keep per month in addition to the existing subscription-dependent